To be honest, I never looked for or used the the test products in any version, so it is entirely possible that they are no longer included. Maybe someone with more info can help you out there, but if they are still in the file package......
Upload a copy of the entire file package to your server into the same folder as your cart. Don't worry, it won't override your configure files. Just remember to go to your server and delete both dist-congure.php files (not the configure.php files in the same folders, you need those) and the zc_install folder unless your current install is older than 1.3.6 (in that case, you need to run the SQL updates in the zc_install folder).